The wankel rotary is a high RPM engine by nature.
Since
HP is proportional to RPM if you reduced the RPM by
half the HP would also
be half while the weight would stay the same. Thus
you would
lose its excellent power to weight ratio advantage.

Allen Chan wrote:

I heard that the "crank shaft" speed is different than
the rotation speed of the revolving triangular rotor.
The "crank shaft" revolves at a higher speed than the
rotor.  It seems that if somebody can change the gear
ratio between the rotor and the "crank shaft", the
"crank shaft" can be reduced to aircraft speeds, while
the internal rotors can stay at the high speeds.

" "crank shaft" speed is different than  the rotation speed of the revolving 
triangular rotor". Correct. The gear ratio cannot be changed. The engine 
won't work and the rotor will jam in the housing.
Please read the info on the web site below.

You could always do something like this :)

What is wrong with a planetary gear box? They work great and last forever.

Paul Lamar
 
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